bad warning in JS for/in loop? (pragma strict)

Unity Engine
1

I can’t loop through transforms in JS (pragma strict) without getting a warning, if I type the variable. It seems wrong.
Bug?
Example:

for(var child:Transform in transform)
{
	//gives WARNING: Implicit downcast from 'Object' to 'UnityEngine.Transform'.
}

//i have to do this to get rid of warning:

for(child in transform)//no type define, no warning!!
{
	var ct:Transform = child as Transform;//get typed
}
2

My guess is that it occurs because Transform is an IEnumerable rather than IEnumerable.

More info (tested);

        //Works fine in C#
        foreach (Transform child in transform)
        {
            print(child.gameObject.name);
        }

        /*Fails because it casts child as object.
        foreach (var child in transform)
        {
            print(child.gameObject.name);
        }*/

        //Also works fine because compiler has sufficient info
        //Uses System.Linq
        foreach (var child in transform.Cast<Transform>())
        {
            print(child.gameObject.name);
        }
3

Just add #pragma downcast